archeology bug or working as intended?....

So I was 1 rare artifact away from the `it belongs in a museum` achievement and the professor title, just finished researching the pandarian rare `umbrella of chi ji` http://www.wowhead.com/item=89684 however it hasn't counted towards the achievement and as such im still stuck on 19/20, do pandarian/mogu artifact rares not count towards the achievements? or is this a bug?

seems to be a bug, I had the `artifact bound quillan www.wowhead.com/item=89611 under research for mogu artifacts and I just completed it and got the achievement, so it seems the umbrella of chi ji doesnt grant a point towards achievements it should, anyone else found this?